Internal-combustion engine



H. J. RANDERZ INTERNAL COMBUS'IION I ENGINE Filed Feb. 6, 1923 Patentedoa: 2s, 1924. l

PATENT OFFICE.

HJ'ALMAR JOHAN RANDERZ, 0F yBACKEBO NACKA, SWEDEN, ASSIGNOR T0 AKTIEBOLAGET ATLAS DIESEL, OF STOCKHOLM, SWEDEN, A CORPORATION OF' SWEDEN.

INTERNAIPCOM'BUSTION ENGINE.

Application led February 6, 19,23. Serial No. 617,340.

To all whom z't may concern.:

Be it known that I, I-IJALMAR JOHAN RANDERZ, a vsubject of the King ofSweden, and resident of Backebo, Nacka, in the Kingdom of Sweden, haveinvented certain new and useful Improvements in Internal- CombustionEngines,'of which the following is a specification.

This invention relates tO an arrangement in internal, combustionengines, by means of `which the air in the combustion'chamber of theli'vorking cylinderat the end Of the com-l pression stroke of the pistonis caused to whirl and' thereby 4is intimately mingled with the injectedfuel. For gaining the said Object the provision of a groove or cavityprovided in the inner end of the piston and extending round the same4and cooperating with Va torus=provided in the cyl-V inder at itsbottom, is combined' with a cylinder bottom which is calotteshaped insuch manner, that the air, which lat the endofl the compression strokeis forced from the chamber, enclosed by the bottom wall of the saidgroove and the side of the'torus, and into the combustion chamber of theengine, will move first toward the fuel inlet, centrally located in thervlinder bottom, and' then downwards in the saine direction as the.

injected, atomized fuel, tl'ie air and the fuel finally whirling roundin the combustion chamber. i

The accompanying drawing shows as an example and in a vertical sectiona. two stroke cycle engine, to which the invention is applied. Thedrawing shows in dotted lines the piston'in its upper position.

2 is a recess with concave bottom surface and provided in the top end ofthe piston 1. The said recess extends round the piston. 4 is a torus orshoulder provided at closed end Or head of the working cylinder 3 andextending round the inner side Of the cylinder, which torus co-Operateswith the said groove for the purpose stated below. During the Operationof the engine the air compressed in the crank chamber 5 passes throughthe channel 6 and opening 7 into the cylinder, in known manner, andejects the combustion gases through the Outlet 8. As the pistonapproaches its upper position, shown by dotted lines, the air which iscon.:

tained in the chamber enclosed by the bOt-` tom of the recess 2 and theside. ofthe 'torus 4, is forced in an oblique direction tour Of the samebeing curved shaped and extending from the torus 4 to the fuel in' letor sprayer 9,y the radius of the calotte of the cylinder decreasing fromthe torus.

The said air forced into the combustion chamber passes along the calotteshaped side of the cylinder lhead toward the sprayer 9 and thendownwards together with the introduced atomized fuel forming forciblewhirls resulting in' anl intimate mixture 'of fuel and air. Owing' t'Othe fact that thee-air moves downwards from the sprayer 9, thus in thesame direction as'the fuel, the airhas no tendency Of counteracting theentrance and spraying of the `fuel.

I claim: v

In an internal combustion engine the combination with a cylinder havinginside a shoulder-shaped part and a piston-reciprocally mounted in saidcylinder and having a recess inthe working face thereof, cO-operativewith the same shoulder-shaped part, as the piston approaches the limitOf its compression stroke, said piston having the portion thereof lyinginwardly Of the recess cup-shaped, of a cylinder head, having theportion thereof, lying inwardly of the.

j shaped surface in relation to the center line e shoulder-shaped part,calotte-shaped with 'v curve-shaped cr'oss section, which rightfrOm thesaid shoulder approaches the longitudinal centre line of the cylinder,and .a

HJ ALMAR JOI-IAN RANDERZ.

llitnesses:

ROBERT A PELGREN, ERNST ELVENOY.

